“A clever man commits no minor blunders.”

“By seeking and blundering we learn.”

“At the moment of commitment the entire universe conspires to assist you.”

“The most foolish of all errors is for clever young men to believe that they forfeit their originality in recognising a truth which has already been recognised by others.”

“Man muss immer tun, was man nicht lassen kann.”

“The intelligent man finds everything laughable, the sensible man hardly anything.”

“Es ist nicht genug, zu wissen, man muß auch anwenden; es ist nicht genug, zu wollen, man muß auch tun.”